. >> president obama has wrapped up talks with mexico's recently elected president. they covered a range of issues from trade to illegal drugs and, of course, border security. but for now at least the details are still under wraps. abc's mary bruce traveling with the president. >> reporter: president obama arrived yesterday in mexico city where the economy tops the agenda during his three-day tour of latin america. the issue of immigration reform, however, will be hard to ignore. >> i'm optimistic about us getting this done because it's the right thing to do. we've seen leaders from both parties indicate that now is the time to get comprehensive immigration reform done. if we're going to get that done now is the time to do it. >> reporter: with congress poised to overhaul the nation's immigration laws mr. obama will have to tread carefully while he's here. any public comments he makes could impact the delicate negotiations back home. although immigration and border security will consume much of the conversation, the trip is intended to focus on economic relations and